EXAMINATION OF DRINKING-WATER. 471 



Ten degroos of Franklaud's scale are equivalent to seven of 

 Clark's. 



Mr. Wancklyn's interpretation of the results of bis mode 

 of investigation are as follows : — 



1st. Chlorine alone does not necessarily indicate the 

 presence of filthy water. 



2d. Free and albuminoid ammonia in water without 

 chlorine indicates a vegetable source of contamination. 



3d. More tlian five grains per gallon of chlorine, accom- 

 panied by more than 0.08 parts per million of free ammonia 

 and more than one-tenth parts per million of albuminoid 

 ammonia is a clear indication that the water is contami- 

 nated with sewage, decaying animal matter, urine, etc., and 

 should be condemned. 



4th. Eight one-hundredths parts per million of free 

 ammonia and one-tenth parts per million of albuminoid 

 ammonia render a water very suspicious, even without much 

 chlorine. 



5th. Albuminoid ammonia, over 0.15 parts per million, 

 ought to condemn the water which contains it absolutely. 



6th. The total solids found in the water should not ex- 

 ceed forty grains per gallon. 



An examination of the subsequent results of analysis 

 shows that one-half of the samples should be condemned. 



